Refactor job API: add JobExecutionContext, update tests

Major breaking change: job interfaces now use JobExecutionContext
instead of threadIndex, enabling thread-aware and dynamic job
dispatching. Updated all job system, SPMD, and test code to match.
Collections improved with new methods and clearer enumerators.
Renamed IJobScheduler.WaitComplete to Wait. Incremented project
versions. Includes bug fixes, documentation, and style updates.

Misaki.HighPerformance.LowLevel/contentFiles/cs/any/Collections/UnsafeStack.cs

@@ -81,9 +81,20 @@ public unsafe struct UnsafeStack<T> : IUnsafeCollection<T>
     public readonly int Capacity => _array.Count;
     public readonly bool IsCreated => _array.IsCreated;
 
-    public Enumerator GetEnumerator() => new((UnsafeStack<T>*)UnsafeUtility.AddressOf(ref this));
-    IEnumerator<T> IEnumerable<T>.GetEnumerator() => GetEnumerator();
-    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+    public Enumerator GetEnumerator()
+    {
+        return new((UnsafeStack<T>*)UnsafeUtility.AddressOf(ref this));
+    }
+
+    IEnumerator<T> IEnumerable<T>.GetEnumerator()
+    {
+        return GetEnumerator();
+    }
+
+    IEnumerator IEnumerable.GetEnumerator()
+    {
+        return GetEnumerator();
+    }
 
     /// <summary>
     /// Invalid constructor, use <see cref="UnsafeStack(int, Allocator, AllocationOption)"/> or <see cref="UnsafeStack(int, ref AllocationHandle, AllocationOption)"/> instead.